[Bug 240451] Boot problem from disk on older Intel hardware (kern.vty="vt")

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240451

            Bug ID: 240451
           Summary: Boot problem from disk on older Intel hardware
                    (kern.vty="vt")
           Product: Base System
           Version: 12.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: bartsch at dssgmbh.de

We are testing FreeBSD 12.0-STABLE on some of our servers to prepare migration
from FreeBSD-10 to FreeBSD-12.
Our current svn info:
URL: svn://svn.freebsd.org/base/stable/12
Relative URL: ^/stable/12
Basis des Projektarchivs: svn://svn.freebsd.org/base
UUID des Projektarchivs: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Revision: 350885

uname -a: FreeBSD dssbkp1.incore 12.0-STABLE FreeBSD 12.0-STABLE r350885
SERVER64  amd64

On older Intel Hardware (SR2400 / SR2500) we are not able to boot from disk
with kern.vty="vt" (boot disk includes software raid - gmirror+gjournal, no
zfs).
Boot stalls immediately after starting the kernel (no matter if GENERIC or
locally modified kernel is used).
In serial console log we see:

Booting [/boot/kernel/kernel]...
panic: pmap_mapdev_internal: too many preinit mappings
cpuid = 0
time = 1
KDB: stack backtrace:
Uptime: 1s

Booting with kern.vty="sc" works without any problem.
Booting from an installation CD, created by "make cdrom" in /usr/src/release of
this version (r350885) works too (vt).
Booting this version on different hardware (HP DL360 G7) works as expected
(same kernel version, gmirror+gjournal).

One of these non-running servers was already mentioned in bug #236838 including
dmesg output.

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